Q:

C program to read time in string format and extract hours, minutes and second also check time validity

belongs to collection: C String Programs

mahmoud2506
Save to bookmark
|
2022-05-03
|
  228 
0

C program to read time in string format and extract hours, minutes and second also check time validity

Given time in string format (HH:MM:SS) and we have to extract time in hours, minutes and seconds, we are also checking whether given time is valid or not using C program.

Here, to read time - we are using fgets() function, which can also be used to read the string, this function has three parameters,

Syntax:

char *fgets(char *string, int N, stdin)

Here,

  1. string - character array to store the input value
  2. N - maximum number of character to read
  3. stdin - a pointer to a file stream, from where we are reading the string (input source)

There is a function ValidateTime ()- which we designed to check whether given time is valid or not, it will return 1, if time is not valid, else it will return 0.

Use of sscanf()

To extract the integer values from formatted string, we can use sscanf() function, which scans (reads) values from the formatted string.

Consider the statement,

sscanf(string , "%d:%d:%d" , &hour,&min,&sec);

Here, values will be scanned and assigned to hour, minute and sec variables.

Example:

    Input:
    Enter the time in "hh:mm:ss" format : "10:20:30"
    Output:
    The Time is : 10:20:30

    Input:
    Enter the time in "hh:mm:ss" format : "25:20:30"
    Output:
    The Time is : Invalid Time. Try Again.
C programming, exam questions, C programming exam-questions,
login and add your own answer to this question

All Answers

mahmoud2506
2022-05-03
need an explanation for this answer? contact us directly to get an explanation for this answer

Program to extract hours, minutes and seconds from the string in C

/** C program to fetch the values of hours,
 * minutes and seconds from the string and
 * print it using integer variables
*/

#include <stdio.h>

// function to validate the time
int ValidateTime(int hh , int mm , int ss)
{
    int ret=0;
    
    if(hh>24)   ret=1;
    if(mm>60)   ret=1;
    if(ss>60)   ret=1;
    
    return ret;
}

// main function
int main()
{
    // declare a char buffer
    char string[100]={0};
    
    // declare some local int variables
    int ret=0,hour=0,min=0,sec=0;
    
    printf("\nEnter the time in "hh:mm:ss" format : ");
    fgets(string,100,stdin);
    
    // fetch the hour,min and sec values from the
    // string and then store it in int variables
    // in order to validate them
    sscanf(string , "%d:%d:%d" , &hour,&min,&sec);
    
    //printf("\nHH : %d MM : %d SS : %d",hour,min,sec);
    
    // validate the time
    ret = ValidateTime(hour,min,sec);
    if(ret)
    {
        printf("\nInvalid Time. Try Again.\n");
    }
    else
    {
        printf("\nThe Time is : %d:%d:%d\n",hour,min,sec);
    }
    return 0;
}

Output

    Run 1 : 
    Enter the time in "hh:mm:ss" format : 10:20:30
    The Time is : 10:20:30

    Run 2 : 
    Enter the time in "hh:mm:ss" format : 25:20:30
    Invalid Time. Try Again.

    Run 3: 
    Enter the time in "hh:mm:ss" format : 10:61:30
    Invalid Time. Try Again.

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

C String Programs
This question belongs to these collections

Similar questions

need a help?

find thousands of online teachers now
Creating string buffer (character pointer), alloca... >>
<< C program to swap adjacent characters of a string...